Questions tagged [high-current]
Say how much current is required, high-current means different things to different people.
249
questions
3
votes
5answers
117 views
High Power Variable Potential Divider
I have a DC high voltage (>270V) high current (>40A) circuit which needs to power a standard LED along the way to a heater. The LED is to indicate whether or not the heater is activated.
I'm ...
1
vote
0answers
53 views
How should I modify a welder to add a pedal to enable the output?
I'm restoring/improving an old welder rated 3.2 kW input, 115 A DC output, 52 V no load.
I'm adding a ready made soft-start circuit based on a NTC plus bypass relay rated 100 A and capacitors to ...
1
vote
1answer
66 views
High current over 5V on PCB panes instead of track
I have leds running for around 600 Watts of 5V leds (120 amps).
The source of the power are three 48V to 5V converters which each can handle 200 watts.
If I would run this amount of Amps over my PCB ...
0
votes
1answer
64 views
10 Amp Current Limit
I have a 28VDC, high current supply (constant voltage) that is required to charge an emergency power supply.
These EPS internals are rated at 15 amps max input current, however, it’s stipulated that ...
0
votes
1answer
34 views
Ground separation between ADC and high current capacitor discharge circuit
I recently designed a capacitor discharge welder for my welding applications, and I come through a problem about separating grounds between AGND of the controller and (-) terminal of the big 1.3 ...
0
votes
1answer
29 views
Connect multiple source pins together to power signal in Eaglesoft
According to PCB shown below, I have a bunch of MOSFETs with HSOF package with 7 pins of source for each and failed to connect EVERY pin to the connector. In other words, when routing the source ...
4
votes
4answers
354 views
Multiple switching LED drivers on single PCB
I am working on a high power LED board project. It requires to have 100 LEDs, of different types and colors. There will need to be 17 individual strands (need to be able to dim them separate.) Max ...
0
votes
2answers
78 views
Stacking M.O.T. to create an E-E core
I just came across this site looking for answers on some questions I have concerning microwave oven transformers (M.O.T.). I am currently going into my third year as an E.E. student and I am trying to ...
1
vote
2answers
148 views
Can single phase AC produce a continuous electric arc?
Constant DC supply and 3 phase AC (in mercury rectifier) can produce a continuous arc. But can single phase AC also produce a continuous arc? Because it is written on the web that arc extinguishes at ...
0
votes
0answers
71 views
Oscilloscope high voltage and current measurements
I have been tasked with measuring both the voltage and current output of a plasma system but have only been provided and oscilloscope to do this (Tektonix TBS 2000 Series 100MHz, 1G/s) and a high ...
0
votes
1answer
88 views
Supercapacitor based lightning-harvester [closed]
Could lightning discharges be harvested and stored in supercapacitor banks? Could supercapacitors withstand and collect lightning?
Lightning usually lasts for about 10 micro seconds and reaches ...
1
vote
0answers
57 views
Standards for colour of conductors of pre-assembled cables
We are designing a product for industrial energy storage systems. Multiple units are connected with pre-fabricated cable assemblies of 2-4 separate leads that are terminated in connectors unique to ...
3
votes
1answer
86 views
How to design a contactless mechanical shaker [closed]
I am trying to design a circuit to make an inductor oscillate with high-current (around 50A) at a low frequency. The inductor will act as a high-powered electromagnet.
Most designs I've worked/messed ...
0
votes
2answers
68 views
High current on PCB to through hole connector
If I have a though-hole connector with 3.5mm pin spacing and the manufacture rates it for 14 amps per contact, how am I supposed to safely carry anywhere near that current over the PCB? Specifically, ...
1
vote
0answers
47 views
What capacitor to use for high voltage & high current filter application
I am designing a filter that needs a capacitor. I am not allowed to paste the schematic here, so only the maximum voltage at and current through the cap, pasted from the spice simulation:
(voltage is ...
1
vote
0answers
93 views
Proper capacitors for ESP8266-12F?, resetting at high current peak
When using the ESP8266-12F on a PCB I designed myself it keeps resetting after a high current spike of another module (Sim800L). I ofcourse tried to solve this using capacitors but I seem to have made ...
0
votes
3answers
143 views
2000A current sensing using STM32
Is there any chance to read 2000A using STM32? I searched the Internet for low-value shunt resistor but nothing found. maybe some kind of current transformer could do the job!!
any help will be ...
0
votes
0answers
138 views
Safe Voltage/Amperage for Soldered Wires - aka When to Crimp Instead
I have found a lot of information that circles around what I'm looking for, but nothing that directly answers it. It is possible there is no right answer.
I am jealous of the Macbook ...
-6
votes
2answers
137 views
Which resistors to use for high current (10A) voltage-divider? [closed]
I'm having a problem determining resistor specs (especially wattage) for my voltage divider circuit [ 27 V to 17.5 \$+-\$ 0.5 V ] on 10 ampere DC supply.
I have an AC (220V 50Hz) to DC (27V 10A) ...
0
votes
1answer
85 views
How to safely limit current for DC12v 30a?
I am plating my vias with electrolysis, and I need to safely limit the current so it doesn't go over 30 amps.
The power supply I'm going to order is, you guessed it, 12V 30A.
I've calculated the ...
0
votes
2answers
64 views
Multiplexing high current connections?
Noob question here.
Currently I'm using a darlington transistor array to drive about 14 IR leds. I want to be use a CD74HC4067 multiplexer to simplify and shrink things up a bit. The IR led's I'm ...
2
votes
0answers
42 views
Suggestions solutions for high current bed of nails style testing [closed]
I'm trying to create a tester board that will hold some power path components (DC input caps, IGBTs, current sensors) that are normally on the Unit Under Test (UUT).
I'd like to connect these ...
0
votes
2answers
52 views
Sizing cables in pulsed power applications
I am looking for rules for sizing cables for short pulses. For example, if I were to run 2000A DC current for 0.5 seconds in a cable, what size would I need? Sizing as if it were continuous current ...
1
vote
1answer
86 views
High voltage and current
I have a DC motor that needs and works nearly 400v and 20A. I chose FDL100N50 for n-channel mosfet also IXTK40P50P for p-channel mosfet.
I connect a 4n35 optocupler for output of every mosfet.
Are ...
1
vote
2answers
107 views
Joining high current wires outdoors
I am conducting an experiment where I would like to heat up 18 AWG copper cables outdoors using to 50-60°C using 60 amps. The wires are wrapped with teflon to prevent damage to the cable. Can I use a ...
7
votes
1answer
948 views
Series pass transistor, LM7812
I am making a 12 volt regulator for a solar panel to power an audio amplifier. I already have a switching regulator for most application but it is very noisy for amplifier even with a lot of filtering....
0
votes
0answers
36 views
Shorting the output of both the channels of L298N
Suppose I started with a project requiring the control of motors and ended with using L298N in my project, realizing that my motor only takes around 1.5A when on load.
Now, with time I realized that ...
2
votes
1answer
179 views
High current, low voltage capacitors
I'm putting together a high current (200A+), low voltage (<5v) rectifier circuit.
I have sufficient bridge rectifiers, but to smooth out the waveform I need a strong enough capacitor bank. Besides ...
0
votes
1answer
101 views
Stabilize circuit on 5V 2A
I have not yet build following circuit:
Circuit in high performance needs 5V 1.7A (measured). I have source which is powerbank with 16 000 mAh. Outputting via ports: USB-C 5V/3A, USB-A 5V/3A, Micro-...
0
votes
1answer
160 views
Sizing a trace on a PCB to carry 50 amps
Currently working on a 4 layer pcb-card where I need to trace for 50 amps, any ideas how I can design it?
Any tips would be appreciated. Thanks!
1
vote
0answers
79 views
Electric heating for glass melting furnace
Some furnaces use electricity for glass melting. Low voltage and high amperage power is passed through the molten glass through 2 molybednum electrodes dipped into the glass. The molten glass acts as ...
2
votes
1answer
161 views
How to generate a high energy electromagnetic wave? Using high voltage or high current?
I am about generating an electromagnetic wave which should be powerful enough. So I should manipulate its electric field and magnetic field simultaneously. As far as I know E amplitude depends on the ...
0
votes
0answers
105 views
How to line a Metal Melter secondary for higher safety
A Metal Melter is a kind of home-made low voltage (less than 40 volts, mine is 3v) welder (small-scale) made from a microwave oven transformer (MOT). I left the primary intact (the thicker wire, which ...
1
vote
1answer
199 views
Switching high voltages with MOSFET at high frequencies
I need to rectify 220V 50Hz AC power to obtain 48V DC output voltage. Up to 40A current can be drawn from the DC side. 10% ripple is acceptable on the rectified voltage.
I am considering two ...
0
votes
1answer
48 views
How to control a lightbar with 20 individual modules? [closed]
The TL;DR version of my question is, how do you control 20 pieces of 12V/1A outputs in the most reliable, compact and cost efficient way, with something programmable?
The long version:
I got a ...
0
votes
4answers
263 views
Too High Voltage Drop across Transformer's Output
I want to get very high current flow thought secondary winding of transformer on my 3 Ohm load. As I apply high voltage of secondary to the load the voltage across it drops dramatically. Only about 2% ...
11
votes
7answers
2k views
How can the ACS712 pin handle 20 A?
I am searching for some current measuring ICs and found the ACS712, but what I can't figure out is how the seemingly small pins can handle the 20 A current since the trace width calculators say that I ...
0
votes
0answers
83 views
4 Layer board with high current return path inner layer
So I am doing a layout for a 4 layer PCB 1 ounce/layer. The Chip supports up to 20A (motor controller driver). The application needs about 12 amps max ( I plan it let it go up to 17A in the event of ...
0
votes
1answer
102 views
Specifying parts for Induction Heater; how to determine current requirements at transformer? [closed]
I'm working on specifying parts for the following circuit:
I intend to have a very large work coil, (like 12" diameter) so I'm expecting to need a lot of power. I'm on a tight budget, though, so ...
1
vote
2answers
219 views
IGBT destroyed. Help me identify any potential problems
I am trying to build an inductive oven control (for temperatures up to 1500 C), that controls the temperature by turning on the the inductive oven on and off like a commercial inductive hotplate.
...
1
vote
0answers
395 views
Pulsed DC, kA range inductive transient protection method
I would like to design a transient protection solution for HVDC_pulse_unit.
HVDC voltage = 3500V , current > 40kA.
Events:
D1 flyback diode survives(50kA surge forward current).
MOVs section did ...
0
votes
2answers
111 views
Can power transformers be used with higher voltages?
I purchased a Japanese transformer for a project I’m doing. It runs on 100VAC, not 120V, something I overlooked. Doing a quick search, Japan seems to use both 50/60Hz, based on the region.
It’s 30 ...
2
votes
2answers
69 views
Will a 300A HV connector fail before a 600A fuse does?
I know this is a silly question but I cannot find ant data indicated it will not. The HV connector rated at 300A @ 85C and it is a 600A fuse, I cannot find a connector with a higher current rating.
...
0
votes
1answer
83 views
MOSFET-switching between two power supplys: how to avoid transverse current?
For a hobby project I would like to switch between two power supplys.
The two power supplys are two 6s LiPo batteries. If one battery is empty i want to immediatelly switch to the other battery. (the ...
1
vote
2answers
114 views
Electrical Heater Confusion
I know that a semiconductor material, that is usually used for heaters in variety of application, heat up due to high current, which flows through them or high power dissipation across them.
But lets ...
0
votes
1answer
82 views
Looking for resources for determining cable requirements for high wattage (MW) applications
I'm doing some personal research on the specifications for cables that can handle megawatt power draws. As an example, the wires needed to supply 450VAC @ 2000A (0.9MW). I'm looking for wire diameters ...
0
votes
2answers
259 views
How to limit HV capacitor charging current?
I have a voltage doubler, which is connected to mains (without galvanic isolation):
It enticed me with its simplicity, configurability and option between charging speed or desulfatability.
The ...
6
votes
1answer
316 views
Switch high voltage with triggered spark gap
I want to switch a high current/voltage pulse (up to few 10kV, <1kA) from a capacitor as supply. It needs to be cheap and I don't care about efficiency too much yet.
I took a look at using ...
1
vote
0answers
386 views
Soldering sheet busbars to PCB concerns
Hello fellow engineers
I have decided to solder busbars to a high current pcb , but i have 2 concerns :
Does soldering a flat busbar (shown in left image) could cause thermal stress and deformation ...
0
votes
2answers
150 views
High current/high voltage/high frequency measurement
I have a circuit that I'm having trouble understanding. It measures the current flowing through a conductor. The measured load is 20-100 Amps, 9kHz-34kHz, and approx. 340 volts. The main conductor ...
